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基于模态分析理论,建立了矩形储液箱箱体和梁单元模型,分别对储液箱空载和满载状态的应力强度和六阶以下振动模态进行分析。结果表明:静水压下满载的支反力为8285.4N,空载的支反力为1222.9N,整个箱体的最大应力强度出现在箱体侧板底部与底板长支撑的连接处,箱体在x、y、z方向的最大位移均小于3.5mm,可以被实际工程所接受;各阶模态频率均非整体结构的共振频率,振型、振幅均在可控和可接受的范围内,可以满足军事装备对可靠性和安全性的要求。对316L、Q235和铝3种不同材料矩形储液箱的技术参数进行对比分析,认为Q235和铝两种材料在今后军事装备的整体性能改进、轻量化和可靠性设计等方面具有不同的技术优势。
Based on the modal analysis theory, the rectangular tank model and the beam element model are established, and the stress intensity and the vibration mode under the sixth order are analyzed respectively in no-load and full-load condition. The results show that the full backup supportive force under hydrostatic pressure is 8285.4N and the no-load supportive force is 1222.9N. The maximum stress intensity of the entire box appears at the junction of the bottom of the box and the long support of the floor, The maximum displacements in the x, y and z directions are all less than 3.5 mm, which can be accepted by the practical engineering. The modal frequencies of all modes are not within the controllable and acceptable range of the resonance frequency, mode shape and amplitude of the whole structure, To meet the military equipment on the reliability and safety requirements. The technical parameters of 316L, Q235 and aluminum rectangular reservoirs with three different materials are compared and analyzed. It is concluded that Q235 and aluminum have different technical advantages in terms of the overall performance improvement, lightweight and reliability design of military equipment in the future .